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CLC number: O39; O368; S7

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Received: 2007-10-21

Revision Accepted: 2008-01-28

Crosschecked: 0000-00-00

Cited: 4

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Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.7 P.907~915

http://doi.org/10.1631/jzus.A0720035


Using FEM to predict tree motion in a wind field


Author(s):  Xiao-yi HU, Wei-ming TAO, Yi-mu GUO

Affiliation(s):  Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   jimhxy@zju.edu.cn

Key Words:  Finite element method (FEM), Fluid-structure interaction (FSI), Vortex-induced vibration (VIV), Asymmetric, Wind field


Xiao-yi HU, Wei-ming TAO, Yi-mu GUO. Using FEM to predict tree motion in a wind field[J]. Journal of Zhejiang University Science A, 2008, 9(7): 907~915.

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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0720035


Abstract: 
In this paper we propose a finite element (FE) simulation method to predict tree motion in a wind field. Two FE tree models were investigated: One model was generated based on a realistic nature-looking geometric tree model, and the other was a symmetric model to investigate the influence of asymmetric material properties on tree motion. The vortex-induced vibration (VIV) theory is introduced to estimate the fluctuating wind force being exerted on tree stems and the fluid-structure interaction (FSI) analysis is also included in the simulation. The results indicate that asymmetric material properties result in the crosswind displacement of the investigated node and the main swaying direction deviation. The simulation reveals that under wind loading, a tree with leaves has much larger swaying amplitude along the wind direction and longer swaying period than a tree without leaves. However, the crosswind swaying amplitude is mainly due to branch interaction. The numerical simulation proved that the interaction of tree branches can prevent dangerous swaying motion developing.

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Reference

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[11] Weber, J., Penn, J., 1995. Creation and Rendering of Realistic Trees. Proceedings of the SIGGRAPH’95 Annual Conference. ACM Press, New York, p.119-127.

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